# -*- coding: utf-8; -*-
#
# test/test_changesfile.py
# Part of ‘dput’, a Debian package upload toolkit.
#
# Copyright © 2015 Ben Finney <ben+python@benfinney.id.au>
#
# This is free software: you may copy, modify, and/or distribute this work
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; version 3 of that license or any later version.
# No warranty expressed or implied. See the file ‘LICENSE.GPL-3’ for details.

""" Unit tests for Debian upload control (‘*.changes’) files. """

from __future__ import (absolute_import, unicode_literals)

import sys
import os
import os.path
import tempfile
import textwrap
import doctest
import email.message
import collections

import testtools
import testscenarios

__package__ = str("test")
__import__(__package__)
sys.path.insert(1, os.path.dirname(os.path.dirname(__file__)))
import dput.dput
from dput.helper import dputhelper

from .helper import (
        StringIO,
        mock,
        patch_system_interfaces,
        make_unique_slug,
        FakeSystemExit,
        EXIT_STATUS_FAILURE,
        make_fake_file_scenarios,
        get_file_doubles_from_fake_file_scenarios,
        setup_file_double_behaviour,
        patch_os_stat,
        FileDouble,
        )
from .test_configfile import (
        set_config,
        patch_runtime_config_options,
        )

__metaclass__ = type


class _FieldsMapping:
    """ A mapping to stand in for the `dict` of an `email.message.Message`. """

    def __init__(self, *args, **kwargs):
        try:
            self._message = kwargs.pop('_message')
        except KeyError:
            raise TypeError("no ‘_message’ specified for this mapping")
        super(_FieldsMapping, self).__init__(*args, **kwargs)

    def __len__(self, *args, **kwargs):
        return self._message.__len__(*args, **kwargs)

    def __contains__(self, *args, **kwargs):
        return self._message.__contains__(*args, **kwargs)

    def __getitem__(self, *args, **kwargs):
        return self._message.__getitem__(*args, **kwargs)

    def __setitem__(self, *args, **kwargs):
        self._message.__setitem__(*args, **kwargs)

    def __delitem__(self, *args, **kwargs):
        self._message.__delitem__(*args, **kwargs)

    def has_key(self, *args, **kwargs):
        return self._message.has_key(*args, **kwargs)

    def keys(self, *args, **kwargs):
        return self._message.keys(*args, **kwargs)

    def values(self, *args, **kwargs):
        return self._message.values(*args, **kwargs)

    def items(self, *args, **kwargs):
        return self._message.items(*args, **kwargs)

    def get(self, *args, **kwargs):
        return self._message.get(*args, **kwargs)


class FakeMessage(email.message.Message, object):
    """ A fake RFC 2822 message that mocks the obsolete `rfc822.Message`. """

    def __init__(self, *args, **kwargs):
        super(FakeMessage, self).__init__(*args, **kwargs)
        self.dict = _FieldsMapping(_message=self)


def make_fake_message(fields):
    """ Make a fake message instance. """
    message = FakeMessage()
    for (name, value) in fields.items():
        message.add_header(name, value)
    return message


def make_files_field_value(params_by_name):
    """ Make a value for “Files” field of a changes document. """
    result = "\n".join(
            " ".join(params)
            for (file_name, params) in params_by_name.items())
    return result


def make_upload_files_params(checksums_by_file_name, sizes_by_file_name):
    """ Make a mapping of upload parameters for files. """
    params_by_name = {
            file_name: [
                checksums_by_file_name[file_name],
                str(sizes_by_file_name[file_name]),
                "foo", "bar", file_name]
            for file_name in checksums_by_file_name}
    return params_by_name


def make_changes_document(fields, upload_params_by_name=None):
    """ Make a changes document from field values.

        :param fields: Sequence of (name, value) tuples for fields.
        :param upload_params_by_name: Mapping from filename to upload
            parameters for each file.
        :return: The changes document as an RFC 822 formatted text.

        """
    document_fields = fields.copy()
    if upload_params_by_name is not None:
        files_field_text = make_files_field_value(upload_params_by_name)
        document_fields.update({'files': files_field_text})
    document = make_fake_message(document_fields)

    return document


def make_changes_file_scenarios():
    """ Make fake Debian upload control (‘*.changes’) scenarios. """
    file_path = make_changes_file_path()

    fake_file_empty = StringIO()
    fake_file_no_format = StringIO(textwrap.dedent("""\
            FOO
            BAR
            Files:
                Lorem ipsum dolor sit amet
            """))
    fake_file_with_signature = StringIO(textwrap.dedent("""\
            -----BEGIN PGP SIGNED MESSAGE-----
            Hash: SHA1

            FOO
            BAR
            Files:
                Lorem ipsum dolor sit amet

            -----BEGIN PGP SIGNATURE-----
            Version: 0.0
            Comment: Proin ac massa at orci sagittis fermentum.

            gibberishgibberishgibberishgibberishgibberishgibberish
            gibberishgibberishgibberishgibberishgibberishgibberish
            gibberishgibberishgibberishgibberishgibberishgibberish
            -----END PGP SIGNATURE-----
            """))
    fake_file_with_format = StringIO(textwrap.dedent("""\
            Format: FOO
            Files:
                Lorem ipsum dolor sit amet
            """))
    fake_file_invalid = StringIO(textwrap.dedent("""\
            Format: FOO
            Files:
                FOO BAR
            """))

    scenarios = [
            ('no-format', {
                'file_double': FileDouble(
                    path=file_path,
                    fake_file=fake_file_no_format),
                'expected_result': make_changes_document({
                    'files': "Lorem ipsum dolor sit amet",
                    }),
                }),
            ('with-pgp-signature', {
                'file_double': FileDouble(
                    path=file_path,
                    fake_file=fake_file_with_signature),
                'expected_result': make_changes_document({
                    'files': "Lorem ipsum dolor sit amet",
                    }),
                }),
            ('with-format', {
                'file_double': FileDouble(
                    path=file_path,
                    fake_file=fake_file_with_format),
                'expected_result': make_changes_document({
                    'files': "Lorem ipsum dolor sit amet",
                    }),
                }),
            ('error empty', {
                'file_double': FileDouble(
                    path=file_path, fake_file=fake_file_empty),
                'expected_error': KeyError,
                }),
            ('error invalid', {
                'file_double': FileDouble(
                    path=file_path,
                    fake_file=fake_file_invalid),
                'expected_error': FakeSystemExit,
                }),
            ]

    for (scenario_name, scenario) in scenarios:
        scenario['changes_file_scenario_name'] = scenario_name

    return scenarios


def set_fake_upload_file_paths(testcase):
    """ Set the fake upload file paths. """
    testcase.fake_upload_file_paths = [
            os.path.join(
                os.path.dirname(testcase.changes_file_double.path),
                os.path.basename(tempfile.mktemp()))
            for __ in range(10)]

    required_suffixes = [".dsc", ".tar.xz"]
    suffixes = required_suffixes + getattr(
            testcase, 'additional_file_suffixes', [])
    file_path_base = testcase.fake_upload_file_paths.pop()
    for suffix in suffixes:
        file_path = file_path_base + suffix
        testcase.fake_upload_file_paths.insert(0, file_path)


def set_file_checksums(testcase):
    """ Set the fake file checksums for the test case. """
    testcase.fake_checksum_by_file = {
            os.path.basename(file_path): make_unique_slug(testcase)
            for file_path in testcase.fake_upload_file_paths}


def set_file_sizes(testcase):
    """ Set the fake file sizes for the test case. """
    testcase.fake_size_by_file = {
            os.path.basename(file_path): testcase.getUniqueInteger()
            for file_path in testcase.fake_upload_file_paths}


def set_file_doubles(testcase):
    """ Set the file doubles for the test case. """
    for file_path in testcase.fake_upload_file_paths:
        file_double = FileDouble(file_path)
        file_double.set_os_stat_scenario('okay')
        file_double.stat_result = file_double.stat_result._replace(
                st_size=testcase.fake_size_by_file[
                    os.path.basename(file_path)],
                )
        file_double.register_for_testcase(testcase)


def setup_upload_file_fixtures(testcase):
    """ Set fixtures for fake files to upload for the test case. """
    set_fake_upload_file_paths(testcase)
    set_file_checksums(testcase)
    set_file_sizes(testcase)
    set_file_doubles(testcase)


def make_changes_file_path(file_dir_path=None):
    """ Make a filesystem path for the changes file. """
    if file_dir_path is None:
        file_dir_path = tempfile.mktemp()
    file_name = os.path.basename(
            "{base}.changes".format(base=tempfile.mktemp()))
    file_path = os.path.join(file_dir_path, file_name)

    return file_path


def setup_changes_file_fixtures(testcase):
    """ Set up fixtures for changes file doubles. """
    file_path = make_changes_file_path()

    scenarios = make_fake_file_scenarios(file_path)
    testcase.changes_file_scenarios = scenarios

    file_doubles = get_file_doubles_from_fake_file_scenarios(
            scenarios.values())
    setup_file_double_behaviour(testcase, file_doubles)


def set_changes_file_scenario(testcase, name):
    """ Set the changes file scenario for this test case. """
    scenario = dict(testcase.changes_file_scenarios)[name]
    testcase.changes_file_scenario = scenario
    testcase.changes_file_double = scenario['file_double']
    testcase.changes_file_double.register_for_testcase(testcase)


class parse_changes_TestCase(
        testscenarios.WithScenarios,
        testtools.TestCase):
    """ Base for test cases for `parse_changes` function. """

    scenarios = NotImplemented

    def setUp(self):
        """ Set up test fixtures. """
        super(parse_changes_TestCase, self).setUp()
        patch_system_interfaces(self)

        self.test_infile = StringIO()


class parse_changes_SuccessTestCase(parse_changes_TestCase):
    """ Success test cases for `parse_changes` function. """

    scenarios = list(
            (name, scenario)
            for (name, scenario) in make_changes_file_scenarios()
            if not name.startswith('error'))

    def test_gives_expected_result_for_infile(self):
        """ Should give the expected result for specified input file. """
        result = dput.dput.parse_changes(self.file_double.fake_file)
        normalised_result_set = set(
                (key.lower(), value.strip())
                for (key, value) in result.items())
        self.assertEqual(
                set(self.expected_result.items()), normalised_result_set)


class parse_changes_ErrorTestCase(parse_changes_TestCase):
    """ Error test cases for `parse_changes` function. """

    scenarios = list(
            (name, scenario)
            for (name, scenario) in make_changes_file_scenarios()
            if name.startswith('error'))

    def test_raises_expected_exception_for_infile(self):
        """ Should raise the expected exception for specified input file. """
        with testtools.ExpectedException(self.expected_error):
            dput.dput.parse_changes(self.file_double.fake_file)


class check_upload_variant_TestCase(
        testscenarios.WithScenarios,
        testtools.TestCase):
    """ Test cases for `check_upload_variant` function. """

    scenarios = [
            ('simple', {
                'fields': {
                    'architecture': "foo bar baz",
                    },
                'expected_result': True,
                }),
            ('arch-missing', {
                'fields': {
                    'spam': "Lorem ipsum dolor sit amet",
                    },
                'expected_result': False,
                }),
            ('source-only', {
                'fields': {
                    'architecture': "source",
                    },
                'expected_result': False,
                }),
            ('source-and-others', {
                'fields': {
                    'architecture': "foo source bar",
                    },
                'expected_result': False,
                }),
            ]

    def setUp(self):
        """ Set up test fixtures. """
        super(check_upload_variant_TestCase, self).setUp()
        patch_system_interfaces(self)

        self.set_changes_document(self.fields)
        self.set_test_args()

    def set_changes_document(self, fields):
        """ Set the package changes document based on specified fields. """
        self.test_changes_document = make_changes_document(fields)

    def set_test_args(self):
        """ Set the arguments for the test call to the function. """
        self.test_args = {
                'changes': self.test_changes_document,
                'debug': False,
                }

    def test_returns_expected_result_for_changes_document(self):
        """ Should return expected result for specified changes document. """
        result = dput.dput.check_upload_variant(**self.test_args)
        self.assertEqual(self.expected_result, result)

    def test_emits_debug_message_showing_architecture(self):
        """ Should emit a debug message for the specified architecture. """
        if 'architecture' not in self.fields:
            self.skipTest("Architecture field not in this scenario")
        self.test_args['debug'] = True
        dput.dput.check_upload_variant(**self.test_args)
        expected_output = textwrap.dedent("""\
                D: Architecture: {arch}
                """).format(arch=self.fields['architecture'])
        self.assertIn(expected_output, sys.stdout.getvalue())

    def test_emits_debug_message_for_binary_upload(self):
        """ Should emit a debug message for the specified architecture. """
        triggers_binaryonly = bool(self.expected_result)
        if not triggers_binaryonly:
            self.skipTest("Scenario does not trigger binary-only upload")
        self.test_args['debug'] = True
        dput.dput.check_upload_variant(**self.test_args)
        expected_output = textwrap.dedent("""\
                D: Doing a binary upload only.
                """)
        self.assertIn(expected_output, sys.stdout.getvalue())


SourceCheckResult = collections.namedtuple(
        'SourceCheckResult', ['include_orig', 'include_tar'])


class source_check_TestCase(
        testscenarios.WithScenarios,
        testtools.TestCase):
    """ Test cases for `source_check` function. """

    default_expected_result = SourceCheckResult(
            include_orig=False, include_tar=False)

    scenarios = [
            ('no-version', {
                'expected_result': default_expected_result,
                }),
            ('no-epoch native-version', {
                'upstream_version': "1.2",
                'expected_result': SourceCheckResult(
                    include_orig=False, include_tar=True),
                }),
            ('epoch native-version', {
                'epoch': "3",
                'upstream_version': "1.2",
                'expected_result': SourceCheckResult(
                    include_orig=False, include_tar=True),
                }),
            ('no-epoch debian-release', {
                'upstream_version': "1.2",
                'release': "5",
                'expected_result': SourceCheckResult(
                    include_orig=False, include_tar=True),
                }),
            ('epoch debian-release', {
                'epoch': "3",
                'upstream_version': "1.2",
                'release': "5",
                'expected_result': SourceCheckResult(
                    include_orig=False, include_tar=True),
                }),
            ('no-epoch new-upstream-version', {
                'upstream_version': "1.2",
                'release': "1",
                'expected_result': SourceCheckResult(
                    include_orig=True, include_tar=False),
                }),
            ('epoch new_upstream-version', {
                'epoch': "3",
                'upstream_version': "1.2",
                'release': "1",
                'expected_result': SourceCheckResult(
                    include_orig=True, include_tar=False),
                }),
            ('no-epoch nmu', {
                'upstream_version': "1.2",
                'release': "4.5",
                'expected_result': SourceCheckResult(
                    include_orig=False, include_tar=True),
                }),
            ('epoch nmu', {
                'epoch': "3",
                'upstream_version': "1.2",
                'release': "4.5",
                'expected_result': SourceCheckResult(
                    include_orig=False, include_tar=True),
                }),
            ('no-epoch nmu before-first-release', {
                'upstream_version': "1.2",
                'release': "0.1",
                'expected_result': SourceCheckResult(
                    include_orig=True, include_tar=False),
                }),
            ('epoch nmu before-first-release', {
                'epoch': "3",
                'upstream_version': "1.2",
                'release': "0.1",
                'expected_result': SourceCheckResult(
                    include_orig=True, include_tar=False),
                }),
            ('no-epoch nmu after-first-release', {
                'upstream_version': "1.2",
                'release': "1.1",
                'expected_result': SourceCheckResult(
                    include_orig=True, include_tar=False),
                }),
            ('epoch nmu after-first-release', {
                'epoch': "3",
                'upstream_version': "1.2",
                'release': "1.1",
                'expected_result': SourceCheckResult(
                    include_orig=True, include_tar=False),
                }),
            ]

    for (scenario_name, scenario) in scenarios:
        fields = {}
        if 'upstream_version' in scenario:
            version_string = scenario['upstream_version']
            if 'epoch' in scenario:
                version_string = "{epoch}:{version}".format(
                        epoch=scenario['epoch'], version=version_string)
            if 'release' in scenario:
                version_string = "{version}-{release}".format(
                        version=version_string, release=scenario['release'])
            fields.update({'version': version_string})
            scenario['version'] = version_string
        scenario['changes_document'] = make_changes_document(fields)
    del scenario_name, scenario
    del fields, version_string

    def setUp(self):
        """ Set up test fixtures. """
        super(source_check_TestCase, self).setUp()
        patch_system_interfaces(self)

        self.test_args = {
                'changes': self.changes_document,
                'debug': False,
                }

    def test_returns_expected_result_for_changes_document(self):
        """ Should return expected result for specified changes document. """
        result = dput.dput.source_check(**self.test_args)
        self.assertEqual(self.expected_result, result)

    def test_emits_version_string_debug_message_only_if_version(self):
        """ Should emit message for version only if has version. """
        self.test_args['debug'] = True
        version = getattr(self, 'version', None)
        message_lead = "D: Package Version:"
        expected_output = textwrap.dedent("""\
                {lead} {version}
                """).format(
                    lead=message_lead, version=version)
        dput.dput.source_check(**self.test_args)
        if hasattr(self, 'version'):
            self.assertIn(expected_output, sys.stdout.getvalue())
        else:
            self.assertNotIn(message_lead, sys.stdout.getvalue())

    def test_emits_epoch_debug_message_only_if_epoch(self):
        """ Should emit message for epoch only if has an epoch. """
        self.test_args['debug'] = True
        dput.dput.source_check(**self.test_args)
        expected_output = textwrap.dedent("""\
                D: Epoch found
                """)
        dput.dput.source_check(**self.test_args)
        if (hasattr(self, 'epoch') and hasattr(self, 'release')):
            self.assertIn(expected_output, sys.stdout.getvalue())
        else:
            self.assertNotIn(expected_output, sys.stdout.getvalue())

    def test_emits_upstream_version_debug_message_only_if_nonnative(self):
        """ Should emit message for upstream version only if non-native. """
        self.test_args['debug'] = True
        upstream_version = getattr(self, 'upstream_version', None)
        message_lead = "D: Upstream Version:"
        expected_output = textwrap.dedent("""\
                {lead} {version}
                """).format(
                    lead=message_lead, version=upstream_version)
        dput.dput.source_check(**self.test_args)
        if hasattr(self, 'release'):
            self.assertIn(expected_output, sys.stdout.getvalue())
        else:
            self.assertNotIn(message_lead, sys.stdout.getvalue())

    def test_emits_debian_release_debug_message_only_if_nonnative(self):
        """ Should emit message for Debian release only if non-native. """
        self.test_args['debug'] = True
        debian_release = getattr(self, 'release', None)
        message_lead = "D: Debian Version:"
        expected_output = textwrap.dedent("""\
                {lead} {version}
                """).format(
                    lead=message_lead, version=debian_release)
        dput.dput.source_check(**self.test_args)
        if hasattr(self, 'release'):
            self.assertIn(expected_output, sys.stdout.getvalue())
        else:
            self.assertNotIn(message_lead, sys.stdout.getvalue())


class verify_files_TestCase(
        testscenarios.WithScenarios,
        testtools.TestCase):
    """ Test cases for `verify_files` function. """

    default_args = dict(
            host="foo",
            check_only=None,
            check_version=None,
            unsigned_upload=None,
            debug=None,
            )

    scenarios = [
            ('default', {}),
            ('binary-only', {
                'check_upload_variant_return_value': False,
                }),
            ('include foo.tar.gz', {
                'additional_file_suffixes': [".tar.gz"],
                'source_check_result': SourceCheckResult(
                    include_orig=False, include_tar=True),
                }),
            ('include foo.orig.tar.gz', {
                'additional_file_suffixes': [".orig.tar.gz"],
                'source_check_result': SourceCheckResult(
                    include_orig=True, include_tar=False),
                }),
            ('unexpected foo.tar.gz', {
                'additional_file_suffixes': [".tar.gz"],
                'expected_rejection_message': (
                    "Package includes a .tar.gz file although"),
                }),
            ('unexpected foo.orig.tar.gz', {
                'additional_file_suffixes': [".orig.tar.gz"],
                'expected_rejection_message': (
                    "Package includes an .orig.tar.gz file although"),
                }),
            ('no distribution', {
                'test_distribution': None,
                }),
            ]

    def setUp(self):
        """ Set up test fixtures. """
        super(verify_files_TestCase, self).setUp()
        patch_system_interfaces(self)

        self.file_double_by_path = {}
        set_config(self, 'exist-simple')
        patch_runtime_config_options(self)

        self.set_test_args()

        setup_changes_file_fixtures(self)
        set_changes_file_scenario(self, 'exist-minimal')
        self.test_args.update(dict(
                path=os.path.dirname(self.changes_file_double.path),
                filename=os.path.basename(self.changes_file_double.path),
                ))

        patch_os_stat(self)

        setup_upload_file_fixtures(self)
        self.set_expected_files_to_upload()

        self.patch_checksum_test()
        self.patch_parse_changes()
        self.patch_check_upload_variant()
        self.set_expected_binary_upload()
        self.set_expected_source_control_file_path()
        self.patch_version_check()
        self.patch_verify_signature()
        self.patch_source_check()

    def set_expected_files_to_upload(self):
        """ Set the expected `files_to_upload` result for this test case. """
        self.expected_files_to_upload = set(
                path for path in self.fake_upload_file_paths)
        self.expected_files_to_upload.add(self.changes_file_double.path)

    def patch_checksum_test(self):
        """ Patch `checksum_test` function for this test case. """
        func_patcher = mock.patch.object(dput.dput, 'checksum_test')
        mock_func = func_patcher.start()
        self.addCleanup(func_patcher.stop)

        def get_checksum_for_file(path, hash):
            return self.fake_checksum_by_file[os.path.basename(path)]
        mock_func.side_effect = get_checksum_for_file

    def set_changes_document(self):
        """ Set the changes document for this test case. """
        self.changes_document = make_changes_document(
                fields={},
                upload_params_by_name=self.upload_params_by_name)
        self.test_distribution = getattr(self, 'test_distribution', "lorem")
        if self.test_distribution is not None:
            self.changes_document.add_header(
                    'distribution', self.test_distribution)
            self.runtime_config_parser.set(
                    self.test_args['host'], 'allowed_distributions',
                    self.test_distribution)

        dput.dput.parse_changes.return_value = self.changes_document

    def patch_parse_changes(self):
        """ Patch `parse_changes` function for this test case. """
        func_patcher = mock.patch.object(dput.dput, 'parse_changes')
        func_patcher.start()
        self.addCleanup(func_patcher.stop)

        self.upload_params_by_name = make_upload_files_params(
                self.fake_checksum_by_file,
                self.fake_size_by_file)
        self.set_changes_document()

    def patch_check_upload_variant(self):
        """ Patch `check_upload_variant` function for this test case. """
        if not hasattr(self, 'check_upload_variant_return_value'):
            self.check_upload_variant_return_value = True

        func_patcher = mock.patch.object(
                dput.dput, 'check_upload_variant',
                return_value=self.check_upload_variant_return_value)
        func_patcher.start()
        self.addCleanup(func_patcher.stop)

    def patch_version_check(self):
        """ Patch `version_check` function for this test case. """
        func_patcher = mock.patch.object(dput.dput, 'version_check')
        func_patcher.start()
        self.addCleanup(func_patcher.stop)

    def patch_verify_signature(self):
        """ Patch `verify_signature` function for this test case. """
        func_patcher = mock.patch.object(dput.dput, 'verify_signature')
        func_patcher.start()
        self.addCleanup(func_patcher.stop)

    def patch_source_check(self):
        """ Patch `source_check` function for this test case. """
        func_patcher = mock.patch.object(dput.dput, 'source_check')
        mock_func = func_patcher.start()
        self.addCleanup(func_patcher.stop)

        source_check_result = getattr(
                self, 'source_check_result', SourceCheckResult(
                    include_orig=False, include_tar=False))
        mock_func.return_value = source_check_result

    def set_test_args(self):
        """ Set test args for this test case. """
        extra_args = getattr(self, 'extra_args', {})
        self.test_args = self.default_args.copy()
        self.test_args['config'] = self.runtime_config_parser
        self.test_args.update(extra_args)

    def set_expected_binary_upload(self):
        """ Set expected value for `binary_upload` flag. """
        self.expected_binary_upload = self.check_upload_variant_return_value

    def set_expected_source_control_file_path(self):
        """ Set expected value for source control file path. """
        file_name = next(
                os.path.basename(file_path)
                for file_path in self.fake_upload_file_paths
                if file_path.endswith(".dsc"))
        if not self.expected_binary_upload:
            self.expected_source_control_file_path = os.path.join(
                    os.path.dirname(self.changes_file_double.path), file_name)
        else:
            self.expected_source_control_file_path = ""

    def test_emits_changes_file_path_debug_message(self):
        """ Should emit debug message for changes file path. """
        self.test_args['debug'] = True
        dput.dput.verify_files(**self.test_args)
        expected_output = textwrap.dedent("""\
                D: Validating contents of changes file {path}
                """).format(path=self.changes_file_double.path)
        self.assertIn(expected_output, sys.stdout.getvalue())

    def test_calls_sys_exit_if_input_read_denied(self):
        """ Should call `sys.exit` if input file read access is denied. """
        set_changes_file_scenario(self, 'error-read-denied')
        with testtools.ExpectedException(FakeSystemExit):
            dput.dput.verify_files(**self.test_args)
        expected_output = textwrap.dedent("""\
                Can't open {path}
                """).format(path=self.changes_file_double.path)
        self.assertIn(expected_output, sys.stdout.getvalue())
        sys.exit.assert_called_with(EXIT_STATUS_FAILURE)

    def test_calls_parse_changes_with_changes_files(self):
        """ Should call `parse_changes` with changes file. """
        dput.dput.verify_files(**self.test_args)
        dput.dput.parse_changes.assert_called_with(
                self.changes_file_double.fake_file)

    def test_calls_check_upload_variant_with_changes_document(self):
        """ Should call `check_upload_variant` with changes document. """
        dput.dput.verify_files(**self.test_args)
        dput.dput.check_upload_variant.assert_called_with(
                self.changes_document, mock.ANY)

    def test_emits_upload_dsc_file_debug_message(self):
        """ Should emit debug message for ‘*.dsc’ file. """
        if getattr(self, 'check_upload_variant_return_value', True):
            self.skipTest("Binary package upload for this scenario")
        self.test_args['debug'] = True
        dput.dput.verify_files(**self.test_args)
        dsc_file_path = next(
                os.path.basename(file_path)
                for file_path in self.fake_upload_file_paths
                if file_path.endswith(".dsc"))
        expected_output = textwrap.dedent("""\
                D: dsc-File: {path}
                """).format(path=dsc_file_path)
        self.assertThat(
                sys.stdout.getvalue(),
                testtools.matchers.Contains(expected_output))

    def test_calls_sys_exit_when_source_upload_omits_dsc_file(self):
        """ Should call `sys.exit` when source upload omits ‘*.dsc’ file. """
        if getattr(self, 'check_upload_variant_return_value', True):
            self.skipTest("Binary package upload for this scenario")
        self.fake_checksum_by_file = dict(
                (file_path, checksum)
                for (file_path, checksum)
                in self.fake_checksum_by_file.items()
                if not file_path.endswith(".dsc"))
        self.patch_parse_changes()
        with testtools.ExpectedException(FakeSystemExit):
            dput.dput.verify_files(**self.test_args)
        expected_output = textwrap.dedent("""\
                Error: no dsc file found in sourceful upload
                """)
        self.assertThat(
                sys.stderr.getvalue(),
                testtools.matchers.Contains(expected_output))
        sys.exit.assert_called_with(EXIT_STATUS_FAILURE)

    def test_calls_version_check_when_specified_in_config(self):
        """ Should call `version_check` when specified in config. """
        self.runtime_config_parser.set(
                self.test_args['host'], 'check_version', "true")
        dput.dput.verify_files(**self.test_args)
        dput.dput.version_check.assert_called_with(
                os.path.dirname(self.changes_file_double.path),
                self.changes_document,
                self.test_args['debug'])

    def test_calls_version_check_when_specified_in_args(self):
        """ Should call `version_check` when specified in arguments. """
        self.test_args['check_version'] = True
        dput.dput.verify_files(**self.test_args)
        dput.dput.version_check.assert_called_with(
                os.path.dirname(self.changes_file_double.path),
                self.changes_document,
                self.test_args['debug'])

    def test_calls_sys_exit_when_host_section_not_in_config(self):
        """ Should call `sys.exit` when specified host not in config. """
        self.runtime_config_parser.remove_section(self.test_args['host'])
        with testtools.ExpectedException(FakeSystemExit):
            dput.dput.verify_files(**self.test_args)
        expected_output = textwrap.dedent("""\
                Error in config file:
                No section: ...
                """)
        self.assertThat(
                sys.stderr.getvalue(),
                testtools.matchers.DocTestMatches(
                    expected_output, doctest.ELLIPSIS))
        sys.exit.assert_called_with(EXIT_STATUS_FAILURE)

    def test_calls_verify_signature_with_expected_args(self):
        """ Should call `verify_signature` with expected args. """
        dput.dput.verify_files(**self.test_args)
        dput.dput.verify_signature.assert_called_with(
                self.test_args['host'],
                self.changes_file_double.path,
                self.expected_source_control_file_path,
                self.runtime_config_parser,
                self.test_args['check_only'],
                self.test_args['unsigned_upload'], mock.ANY,
                self.test_args['debug'])

    def test_calls_source_check_with_changes_document(self):
        """ Should call `source_check` with changes document. """
        dput.dput.verify_files(**self.test_args)
        dput.dput.source_check.assert_called_with(
                self.changes_document, self.test_args['debug'])

    def test_emits_upload_file_path_debug_message(self):
        """ Should emit debug message for each upload file path. """
        self.test_args['debug'] = True
        dput.dput.verify_files(**self.test_args)
        for file_path in self.fake_upload_file_paths:
            expected_output = textwrap.dedent("""\
                    D: File to upload: {path}
                    """).format(path=file_path)
            self.expectThat(
                    sys.stdout.getvalue(),
                    testtools.matchers.Contains(expected_output))

    def test_calls_checksum_test_with_upload_files(self):
        """ Should call `checksum_test` with each upload file path. """
        dput.dput.verify_files(**self.test_args)
        expected_calls = [
                mock.call(file_path, mock.ANY)
                for file_path in self.fake_upload_file_paths]
        dput.dput.checksum_test.assert_has_calls(
                expected_calls, any_order=True)

    def set_bogus_file_checksums(self):
        """ Set bogus file checksums that will not match. """
        self.fake_checksum_by_file = {
                file_name: self.getUniqueString()
                for file_name in self.fake_checksum_by_file}

    def test_emits_checksum_okay_debug_message(self):
        """ Should emit debug message checksum okay for each file. """
        self.test_args['debug'] = True
        dput.dput.verify_files(**self.test_args)
        for file_path in self.fake_upload_file_paths:
            expected_output = textwrap.dedent("""\
                    D: Checksum for {path} is fine
                    """).format(path=file_path)
            self.expectThat(
                    sys.stdout.getvalue(),
                    testtools.matchers.Contains(expected_output))

    def test_emits_checksum_mismatch_debug_message(self):
        """ Should emit debug message when a checksum does not match. """
        self.test_args['debug'] = True
        self.set_bogus_file_checksums()
        with testtools.ExpectedException(FakeSystemExit):
            dput.dput.verify_files(**self.test_args)
        expected_output = textwrap.dedent("""\
                ...
                D: Checksum from .changes: ...
                D: Generated Checksum: ...
                ...
                """)
        self.assertThat(
                sys.stdout.getvalue(),
                testtools.matchers.DocTestMatches(
                    expected_output, doctest.ELLIPSIS))

    def test_calls_sys_exit_when_checksum_mismatch(self):
        """ Should call `sys.exit` when a checksum does not match. """
        specified_checksum_by_file = self.fake_checksum_by_file
        self.set_bogus_file_checksums()
        with testtools.ExpectedException(FakeSystemExit):
            dput.dput.verify_files(**self.test_args)

        expected_output_for_files = [
                textwrap.dedent("""\
                    Checksum doesn't match for {file_name}
                    """).format(
                        file_name=os.path.join(
                            os.path.dirname(self.changes_file_double.path),
                            file_name),
                        specified_hash=specified_hash,
                        computed_hash=self.fake_checksum_by_file[file_name])
                for (file_name, specified_hash)
                in specified_checksum_by_file.items()]
        self.assertThat(
                sys.stdout.getvalue(),
                testtools.matchers.MatchesAny(*[
                    testtools.matchers.Contains(expected_output)
                    for expected_output in expected_output_for_files]))
        sys.exit.assert_called_with(EXIT_STATUS_FAILURE)

    def test_calls_os_stat_with_upload_files(self):
        """ Should call `os.stat` with each upload file path. """
        dput.dput.verify_files(**self.test_args)
        expected_calls = [
                mock.call(file_path)
                for file_path in self.fake_upload_file_paths]
        os.stat.assert_has_calls(expected_calls, any_order=True)

    def set_bogus_file_sizes(self):
        """ Set bogus file sizes that will not match. """
        file_double_registry = FileDouble.get_registry_for_testcase(self)
        for file_name in self.fake_size_by_file:
                bogus_size = self.getUniqueInteger()
                self.fake_size_by_file[file_name] = bogus_size
                file_path = os.path.join(
                        os.path.dirname(self.changes_file_double.path),
                        file_name)
                file_double = file_double_registry[file_path]
                file_double.stat_result = file_double.stat_result._replace(
                        st_size=bogus_size)

    def test_emits_size_mismatch_debug_message(self):
        """ Should emit debug message when a size does not match. """
        self.test_args['debug'] = True
        self.set_bogus_file_sizes()
        dput.dput.verify_files(**self.test_args)
        expected_output = textwrap.dedent("""\
                ...
                D: size from .changes: ...
                D: calculated size: ...
                ...
                """)
        self.assertThat(
                sys.stdout.getvalue(),
                testtools.matchers.DocTestMatches(
                    expected_output, doctest.ELLIPSIS))

    def test_emits_size_mismatch_message_for_each_file(self):
        """ Should emit error message for each file with size mismatch. """
        self.set_bogus_file_sizes()
        dput.dput.verify_files(**self.test_args)
        for file_path in self.fake_upload_file_paths:
            expected_output = textwrap.dedent("""\
                    size doesn't match for {path}
                    """).format(path=file_path)
            self.expectThat(
                    sys.stdout.getvalue(),
                    testtools.matchers.Contains(expected_output))

    def test_emits_rejection_warning_when_unexpected_tarball(self):
        """ Should emit warning of rejection when unexpected tarball. """
        if not hasattr(self, 'expected_rejection_message'):
            self.skipTest("No rejection message expected")
        dput.dput.verify_files(**self.test_args)
        sys.stderr.write("calls: {calls!r}\n".format(
                calls=sys.stdout.write.mock_calls))
        self.assertThat(
                sys.stdout.getvalue(),
                testtools.matchers.Contains(self.expected_rejection_message))

    def test_raises_error_when_distribution_mismatch(self):
        """ Should raise error when distribution mismatch against allowed. """
        if not getattr(self, 'test_distribution', None):
            self.skipTest("No distribution set for this test case")
        self.runtime_config_parser.set(
                self.test_args['host'], 'allowed_distributions',
                "dolor sit amet")
        with testtools.ExpectedException(dputhelper.DputUploadFatalException):
            dput.dput.verify_files(**self.test_args)

    def test_emits_changes_file_upload_debug_message(self):
        """ Should emit debug message for upload of changes file. """
        self.test_args['debug'] = True
        dput.dput.verify_files(**self.test_args)
        expected_output = textwrap.dedent("""\
                D: File to upload: {path}
                """).format(path=self.changes_file_double.path)
        self.assertIn(expected_output, sys.stdout.getvalue())

    def test_returns_expected_files_to_upload_collection(self):
        """ Should return expected `files_to_upload` collection value. """
        result = dput.dput.verify_files(**self.test_args)
        expected_result = self.expected_files_to_upload
        self.assertEqual(expected_result, set(result))


class guess_upload_host_TestCase(
        testscenarios.WithScenarios,
        testtools.TestCase):
    """ Test cases for `guess_upload_host` function. """

    changes_file_scenarios = [
            ('no-distribution', {
                'fake_file': StringIO(textwrap.dedent("""\
                    Files:
                        Lorem ipsum dolor sit amet
                    """)),
                }),
            ('distribution-spam', {
                'fake_file': StringIO(textwrap.dedent("""\
                    Distribution: spam
                    Files:
                        Lorem ipsum dolor sit amet
                    """)),
                }),
            ('distribution-beans', {
                'fake_file': StringIO(textwrap.dedent("""\
                    Distribution: beans
                    Files:
                        Lorem ipsum dolor sit amet
                    """)),
                }),
            ]

    scenarios = [
            ('distribution-found-of-one', {
                'changes_file_scenario_name': "distribution-spam",
                'test_distribution': "spam",
                'config_scenario_name': "exist-distribution-one",
                'expected_host': "foo",
                }),
            ('distribution-notfound-of-one', {
                'changes_file_scenario_name': "distribution-beans",
                'test_distribution': "beans",
                'config_scenario_name': "exist-distribution-one",
                'expected_host': "ftp-master",
                }),
            ('distribution-first-of-three', {
                'changes_file_scenario_name': "distribution-spam",
                'test_distribution': "spam",
                'config_scenario_name': "exist-distribution-three",
                'expected_host': "foo",
                }),
            ('distribution-last-of-three', {
                'changes_file_scenario_name': "distribution-beans",
                'test_distribution': "beans",
                'config_scenario_name': "exist-distribution-three",
                'expected_host': "foo",
                }),
            ('no-configured-distribution', {
                'changes_file_scenario_name': "distribution-beans",
                'config_scenario_name': "exist-distribution-none",
                'expected_host': "ftp-master",
                }),
            ('no-distribution', {
                'changes_file_scenario_name': "no-distribution",
                'config_scenario_name': "exist-simple",
                'expected_host': "ftp-master",
                }),
            ('default-distribution', {
                'config_scenario_name': "exist-default-distribution-only",
                'config_default_default_host_main': "consecteur",
                'expected_host': "consecteur",
                }),
            ]

    def setUp(self):
        """ Set up test fixtures. """
        super(guess_upload_host_TestCase, self).setUp()
        patch_system_interfaces(self)

        set_config(
                self,
                getattr(self, 'config_scenario_name', 'exist-minimal'))
        patch_runtime_config_options(self)

        self.setup_changes_file_fixtures()
        set_changes_file_scenario(
                self,
                getattr(self, 'changes_file_scenario_name', 'no-distribution'))

        self.set_test_args()

    def set_test_args(self):
        """ Set the arguments for the test call to the function. """
        self.test_args = dict(
                path=os.path.dirname(self.changes_file_double.path),
                filename=os.path.basename(self.changes_file_double.path),
                config=self.runtime_config_parser,
                )

    def setup_changes_file_fixtures(self):
        """ Set up fixtures for fake changes file. """
        file_path = make_changes_file_path()

        scenarios = [s for (__, s) in self.changes_file_scenarios]
        for scenario in scenarios:
            scenario['file_double'] = FileDouble(
                    file_path, scenario['fake_file'])
        setup_file_double_behaviour(
                self,
                get_file_doubles_from_fake_file_scenarios(scenarios))

    def test_calls_sys_exit_if_read_denied(self):
        """ Should call `sys.exit` if read permission denied. """
        self.changes_file_double.set_os_access_scenario('denied')
        self.changes_file_double.set_open_scenario('read_denied')
        with testtools.ExpectedException(FakeSystemExit):
            dput.dput.guess_upload_host(**self.test_args)
        expected_output = textwrap.dedent("""\
                Can't open {path}
                """).format(path=self.changes_file_double.path)
        self.assertIn(expected_output, sys.stdout.getvalue())
        sys.exit.assert_called_with(EXIT_STATUS_FAILURE)

    def test_returns_expected_host(self):
        """ Should return expected host value. """
        result = dput.dput.guess_upload_host(**self.test_args)
        self.assertEqual(self.expected_host, result)

    @mock.patch.object(dput.dput, 'debug', True)
    def test_emits_debug_message_for_host(self):
        """ Should emit a debug message for the discovered host. """
        config_parser = self.runtime_config_parser
        if not (
                config_parser.has_section(self.expected_host)
                and config_parser.get(self.expected_host, 'distributions')):
            self.skipTest("No distributions specified")
        dput.dput.guess_upload_host(**self.test_args)
        expected_output = textwrap.dedent("""\
                D: guessing host {host} based on distribution {dist}
                """).format(
                    host=self.expected_host, dist=self.test_distribution)
        self.assertIn(expected_output, sys.stdout.getvalue())


# Local variables:
# coding: utf-8
# mode: python
# End:
# vim: fileencoding=utf-8 filetype=python :
